Eventos
assassination of Francis Ferdinand, Austria-Hungary declares war on Serbia, beginning World War I.Germany invades Luxembourg and Belgium. France invades Alsace. British forces arrive in France.Austria-Hungary invades Russia.Allied forces halt German advance into France during First Battle of the Marne.Allied forces halt German advance into France during First Battle of the Marne.Allied forces land on the Gallipoli Peninsula of the Ottoman Empire.German submarine sinks the passenger liner Lusitania during crossing from New York to Liverpool, England, killing 128 Americans.Italy declares war on Austria-Hungary.Germany begins the attack on Verdun.Naval Battle of Jutland takes place between British and German fleets.Allied offensive begins the Battle of the Somme.Battle of Verdun ends with 550,000 French and 450,000 German casualties.Germany returns to unrestricted submarine warfare halted after the sinking of the Lusitania.United States severs diplomatic relations with Germany.
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